Pressure regulating valve for regulating the pressure in a high-pressure reservoir

摘要

The invention relates to a machine tool having working field illumination disposed in a housing, having an illumination mechanism and a transparent element which allows the light from the illumination mechanism to be led out toward the working field. A light beam can be deflected between the illumination mechanism and the transparent element. According to the invention, the transparent element forms a region of the housing.

主权项

1. A pressure regulating valve for regulating pressure in a high-pressure reservoir of an internal combustion engine, in which the pressure regulating valve can be connected to the high-pressure reservoir, the pressure regulating valve comprising:
a valve piston which is urged in a closing direction by a spring force of a spring, counter to the pressure in the high-pressure reservoir; a controllable first magnet device whose force acts on the valve piston counter to the spring force; and a second magnet device whose force reinforces the spring force on the valve piston, wherein the spring force of the spring is less than the force acting in an opposite direction on the valve piston upon attainment of an allowable system pressure in the high-pressure reservoir.